39 Jeff first came to Australia as a tourist and became a(n) ______ immigrant because he didn't actually leave the country before his visa was expired.
(A) perpetual
(B) substantial
(C) unrestricted
(D) undocumented

Jeff first came to Australia as a tourist and became a undocumented immigrant because he didn't actually leave the country before his visa was expired.
Jeff最初是作為一名遊客來到澳大利亞的，因為他在簽證過期之前並沒有真正離開這個國家，所以成為了一名無證移民。

字根來源：E4F
perpetual中文(繁體)翻譯：劍橋詞典 (cambridge.org)
(per：through,completely+pet/pter：rush,fly+al)
1、continuing for ever in the same way
2、often repeated


substantial中文(繁體)翻譯：劍橋詞典 (cambridge.org)
(sub/su：under+sta/stit/sist：stand,set up,be+ance+al)
1、large in size, value, or importance
2、relating to the main or most important things being considered

unrestricted中文(繁體)翻譯：劍橋詞典 (cambridge.org)
(un：not+re：back,again+strict/strain/string/stress：tighten,tight+ed)
1、not limited or controlled by rules or laws

undocumented中文(繁體)翻譯：劍橋詞典 (cambridge.org)
(un：not+doc/dac：teach+ment+ed)
1、not supported by written proof
2、not having any documents to prove that you are living or working in a country legally